Broccoli Cauliflower Ground Beef Casserole

For the beef:

• ½ tablespoon mild olive oil
• ⅓ cup minced white or yellow onion (you should need a little less than ½ of a small onion for that)
• ¾ pound lean ground beef
• ⅜ teaspoon onion powder
• ⅜ teaspoon garlic powder
• ¾ teaspoon smoked hot paprika
• ⅜ teaspoon salt
• ½ teaspoon ground black pepper

For the broccoli and the cauliflower:

• 4 ounces small broccoli florets (about 2 cups)
• 5 ounces small cauliflower florets (about 1 ¾ cups)

For the hash browns:

• 2 cups frozen shredded hash browns (about 5 ½ ounces)

For the sauce:

• 8 ounces full-fat block cream cheese,* softened
• ½ cup full-fat sour cream*
• 1 large egg
• 6 tablespoons heavy cream
• 1 ½ tablespoons hot sauce, such as Louisiana hot sauce
• 1 ¼ cups grated sharp cheddar cheese, divided into ¾ cup and ½ cup